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It may seem strange to devote an entire movie to turning your camera on, but a lot of things happen when you power up your camera, and it's important to understand what they are and how you can alter them. Because the lens of a camera is removable, it's possible for dust to get inside the camera body and get on the sensor. If that happens, you will see smudges and spots and things on your images. There is a clear filter in front of the image sensor in your camera, so dust never actually gets on the sensor itself but gets on that filter instead.
When you turn the camera on, it shakes that filter at very high speed to shake off any dust. There is a sticky piece of tape or something beneath the filter that traps any dust bits that fall off, and there are a number of ways that you can rearrange and customize that cleaning function. You've probably spotted the power switch already. It's this Of/On thing right here, the switch next to the mode dial. Just switch it to the On position. You won't see much happen. You may see this red light, light up. This is the Read/Write activity light, so anytime the camera is reading or writing to the card, it will light this up.
Now at power-up, it's not actually writing any data to the card, but it does check to see that it's there, so that's why we were getting a little activity there. And obviously the LCD screen lights up, and we will be looking in great detail at what the various things are that happen on the screen. If you are not using your flash a lot and if you're not using the LCD screen a lot--maybe you are reviewing images after every shot, doing a little bit of image review but not sitting around watching it a whole lot--you ought to be able to get about 1600 shots off of a fully charged brand-new battery.
That will go down over time as the battery starts to wear out, but believe me that's a tremendous amount of shooting off of a single charge. This camera is very economical in its battery use. Something else that happens that you didn't see was that the sensor cleaned itself, and that same thing happens when you switch the camera off. But when you do that, it actually tells you that it's cleaning the sensor for a little bit. Something else to know: the sensor cleaning does take a little while, but if you switch the camera on and half-press the Shutter button, it immediately stops cleaning the sensor.
So that means you don't have to wait for the sensor to finish doing something before you can take a shot. Don't worry about the sensor cleaning. It will just be there doing its thing, and it will stay out of your way. As you will see later, there are some settings you can adjust to change how sensor cleaning works.
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